Microstructure change of silver-plated copper electrical connectors exposed in coastal atmosphere
[Introduction]The changes in microstructure of silver-plated copper electrical connectors exposed in coastal atmosphere are needed to be studied.[Method]The appearance,microscopic morphology,and electrochemical corrosion behavior of silver-plated copper electrical connectors after exposure in coastal atmosphere for different time were analyzed and compared.[Result]The electrical connectors were silver-white after exposure in coastal atmosphere for 1 year,but turned to light yellow after 3 years,and covered with green copper corrosion products after 6 years.The scanning electron microscopic characterization showed that the silver coating on the surface of electrical connector was essentially intact during the initial 3 years of exposure to marine atmosphere,and its main phases were monomeric Ag and Ag2O.While the silver coating was also exfoliated and there were Cu,CuO,and Cu(OH)2 on the product surface after 6 years.The electrochemical test results showed that the electrical conductivity of electrical connector was decreased gradually with the extending of exposure time to coastal atmosphere.[Conclusion]This study is expected to provide reference for service life evaluation of silver-plated copper electrical connectors in coastal atmosphere.
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